Menu and Friends workstream

[guidari]

Closes carbon-design-system/carbon-website#3790
Closes carbon-design-system/carbon-website#3792
Closes carbon-design-system/carbon-website#3791

To see the specs go to this issue.

Note: the changes were made in the OverflowMenu with feature flag

Changelog

New

• The ellipsis to the Primary button
• New prop in the ComboButton, MenuButton and OverflowMenu components
• Two new props in the Menu component
• New docs for ComboButton, MenuButton and OverflowMenu components
• Test for new menuAlignment prop
• Added new stories called "Component Menu Alignment" for the Menu and friends
• Added new shadow styling for top alignment

Testing / Reviewing for ComboButton, MenuButton and OverflowMenu

• Test the ellipsis in the Primary Button and Menu
• Test the 3 different components
• Test the different alignments in the playground with different postions of the Primary Button

DO NOT MERGE UNTIL PLAYGROUND TEST IS REMOVED

• Remove Playground test alignment in ComboButton

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[tw15egan]

LGTM 👍 ✅

[tay1orjones]

This is looking awesome! Just a few questions from my end.

Also I think it would be a good idea to mark all new positioning/width/alignment props as experimental because eventually we'll want to flip out parts of the implementation to use floating-ui.

[tay1orjones]

@guidari this looks good to me, ready to merge after removing the testing stories 👍